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Re: [RFC PATCH net-next v3 1/2] macb: Add 1588 support in Cadence GEM.

From Richard Cochran <richardcochran@gmail.com>
Newsgroups linux.kernel
Subject Re: [RFC PATCH net-next v3 1/2] macb: Add 1588 support in Cadence GEM.
Date 2016-12-09 10:00 +0100
Message-ID <sMpc6-16k-25@gated-at.bofh.it> (permalink)
References <sLMkq-1Oz-25@gated-at.bofh.it> <sLQem-4fD-11@gated-at.bofh.it> <sLRN7-5kc-9@gated-at.bofh.it> <sM8bf-7j1-15@gated-at.bofh.it> <sMm4x-7Lb-13@gated-at.bofh.it>
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On Fri, Dec 09, 2016 at 11:07:23AM +0530, Harini Katakam wrote:
> I'm afraid I don't get why we are choosing the most limited max adj..
> Sorry if I'm missing something - could you please help me understand?

This max_adj is only important when the local clock offset is large
and user space chooses not to step the time value.  In that case, user
space will want to run the clock as fast (or as slow) as possible in
order to catch up with the remote clock.

The driver must provide a max_adj that is always safe for user space
to apply via the clock_adjtime() system call.

HTH,
Richard

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Thread

[RFC PATCH net-next v3 1/2] macb: Add 1588 support in Cadence GEM. Andrei Pistirica <andrei.pistirica@microchip.com> - 2016-12-07 16:30 +0100
  [RFC PATCH net-next v3 2/2] macb: Enable 1588 support in SAMA5Dx platforms. Andrei Pistirica <andrei.pistirica@microchip.com> - 2016-12-07 16:30 +0100
    Re: [RFC PATCH net-next v3 2/2] macb: Enable 1588 support in SAMA5Dx  platforms. Richard Cochran <richardcochran@gmail.com> - 2016-12-07 20:50 +0100
  Re: [RFC PATCH net-next v3 1/2] macb: Add 1588 support in Cadence  GEM. Richard Cochran <richardcochran@gmail.com> - 2016-12-07 20:40 +0100
    Re: [RFC PATCH net-next v3 1/2] macb: Add 1588 support in Cadence  GEM. Richard Cochran <richardcochran@gmail.com> - 2016-12-07 22:20 +0100
      RE: [RFC PATCH net-next v3 1/2] macb: Add 1588 support in Cadence  GEM. <Andrei.Pistirica@microchip.com> - 2016-12-08 15:50 +0100
        Re: [RFC PATCH net-next v3 1/2] macb: Add 1588 support in Cadence GEM. Harini Katakam <harinikatakamlinux@gmail.com> - 2016-12-09 06:40 +0100
          Re: [RFC PATCH net-next v3 1/2] macb: Add 1588 support in Cadence  GEM. Richard Cochran <richardcochran@gmail.com> - 2016-12-09 10:00 +0100
        RE: [RFC PATCH net-next v3 1/2] macb: Add 1588 support in Cadence  GEM. Rafal Ozieblo <rafalo@cadence.com> - 2016-12-09 10:30 +0100
    Re: [RFC PATCH net-next v3 1/2] macb: Add 1588 support in Cadence  GEM. Nicolas Ferre <nicolas.ferre@atmel.com> - 2016-12-08 11:10 +0100

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